Pinworm infection

Disease Description (Causes and Symptoms)

• Definition: Enterobiasis is an infection caused by pinworms (Enterobius vermicularis), an intestinal parasite.
• Causes·Pathophysiology: Adult female pinworms mainly move to the area around the anus at night and lay eggs. The eggs have a sticky surface and secrete substances that cause itching, leading to severe pruritus around the anus. They can be reintroduced into the mouth through the hands (autoinfection) or cause household cluster infections among family members through household items and bedding. Pinworm eggs survive for a long time even in dry environments. In general, the parasite cycle is approximately 2 months.
• Main symptoms: Severe itching around the anus (especially at night), sleep disturbances·restlessness, and thread-like worms (worm bodies) observed in the stool or on clothing; in children, loss of appetite·irritability may occur. Eczema or secondary bacterial infection may develop as a result of scratching. Rarely, vulvovaginitis (migration into the vagina) or urinary tract symptoms may occur in girls.

Treatment Methods

• Drug treatment (standard·recommended)
  • Mebendazole: Adults·children generally take a single 100 mg dose; repeat dosing after 1–2 weeks is recommended (to prevent reinfection). (Reflecting RAG information)
  • Albendazole: According to RAG criteria, a single dose of 200 mg for children under 2 years of age and 400 mg for those aged 2 years or older is administered, followed by repeat dosing after 3 weeks. (Follow the doctor’s prescription)
  • Pyrantel pamoate: Used as an alternative drug; generally, a single dose of 11 mg/kg (maximum 1 g) is taken, followed by repeat dosing 2 weeks later (varies according to national guidelines).
  • The choice of drug, dosage, and timing of repeat dosing are determined by the doctor according to the patient’s condition, including age·weight·pregnancy status.
• Non-drug·lifestyle management
  • Simultaneous treatment of the entire family is recommended (to prevent cluster infections).
  • Shower and wash the anal area immediately after getting up in the morning (to remove eggs). Keep fingernails and toenails short and maintain thorough hand hygiene (wash frequently with soap).
  • Wash bedding·sleepwear·underwear·towels and other items frequently using hot water, or wash and dry them at high temperatures. Thoroughly clean carpets·toys·corners of furniture and vacuum regularly.
  • Prevent scratching during sleep (such as with wrist guards) and teach children not to put their hands in their mouths after touching the area around the anus.
• Precautions and risk of complications
  • Reinfection is common even after treatment, so hygiene management and simultaneous treatment of the family are important.
  • Consult a doctor about using medication during pregnancy (especially in early pregnancy).
  • Complications may include secondary bacterial infection caused by scratching, vulvovaginitis·urinary tract infection in children, and, rarely, ectopic invasion by the worms (such as appendicitis-like symptoms).

Checklist Before an Outpatient Visit (Items to Bring and Things to Confirm at Registration)

• Items·information to bring
  • A list of currently used medications (including prescriptions·English drug names) and a history of allergies.
  • Previous relevant test results (if available) and a record of when recent symptoms began·the pattern of symptoms (degree of nighttime itching, impact on sleep, etc.).
  • Whether anyone in the family has symptoms and the hygiene conditions at home (pets, communal living arrangements, etc.).
  • If possible, providing a Scotch tape test performed in the morning (often performed directly by the doctor) or a smartphone photo of worms observed in the stool can help with diagnosis.
• Precautions before the visit
  • The Scotch tape test should be performed around the anus immediately after getting up in the morning, before washing, for accurate results (if you prepared the test yourself, inform the doctor).
  • If you have already taken medication, note the date and time of dosing and report it at the visit.

Examples of General Questions to Ask the Doctor

• "What are the main side effects of the medication you prescribed, and what symptoms should prompt me to stop taking it?"
• "Does the entire family need to be treated together? Should household members take the medication even if they have no symptoms?"
• "How quickly do symptoms (itching) improve after treatment? When can normal activities (kindergarten·school, etc.) be resumed?"
• "What is the most important aspect of household hygiene management to prevent reinfection?"

Examples of Condition-Specific Questions

• For parents or guardians of children: "What medication should be used for my child, and what is the exact dosage? Is there a safe treatment recommended for infants under 2 years of age?"
• In cases of relapse·recurrent infection: "If the infection recurs several times, are additional tests (parasite testing, home-environment assessment, etc.) needed? How should the treatment plan (dosing intervals·number of doses) be adjusted?"

(Medical decisions and medication administration should ultimately follow the diagnosis·prescription of the attending doctor.)